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Rules for Naming Binary Ionic Compounds Containing a Metal Ion With a Variable Charge. A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal. For example, iron(III) iodide, FeI3, is composed of iron ions, Fe3+ (elemental iron is a metal), and iodide ions, I- (elemental iodine is a nonmetal). Rule 1.
First of all, decide if the compound is ionic, covalent-molecular or an acid. Each of. these three has its own rules that cannot be mixed and matched. Naming ionic compounds: Name the cation then the anion. Examples: NaNO3 sodium nitrate. Na2SO4 sodium sulfate. CaCl2 calcium chloride. K3PO4 potassium phosphate.